---
title: "L-Shaped Bench Cushions: Corner Math, Pieces and Measuring"
url: "https://cushionguide.com/cushions/l-shaped-cushions/"
section: "The Cushion Atlas"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-01-09"
updated: "2026-09-24"
keywords: "L-shaped bench cushion, L-shaped cushion, corner bench cushion, L-shaped banquette cushions, corner nook cushion, L-shaped window seat cushion"
---

# L-shaped bench cushions: two rectangles and one honest corner

*An L-shaped bench is two straight runs arguing over one corner. I settle it with a tape measure, one subtraction and a drawing you approve before any foam is cut.*

> **The quick answer:** An L-shaped bench cushion is normally made as two separate rectangles that butt together at the corner. One runs the full length of its wall into the corner; the other is shortened by that cushion's depth, so a 61 in run beside a 19 in deep cushion needs a piece of about 42 in. A one-piece L is possible for small corners, from a confirmed template.

![Two sage bouclé cushions forming an L on an oak-framed corner storage bench, with round table and wildflowers](https://cushionguide.com/media/l-shaped-cushions/sage-l-shaped-bench-cushions-kitchen-nook-leaded-window-928.webp "Two sage cushions meet in the corner of a kitchen nook, each cut to its own run of bench.")

## What an L-shaped cushion is, and where the corner lives

One mistake comes up again and again with L-shaped seats: one leg comes out too long, because the corner was counted twice. The fix costs one subtraction, so let's do it before you order.

An L-shaped bench cushion covers two benches that meet at a corner: a breakfast nook, a corner window seat between two windows, a mudroom bench under the coat hooks, a concrete fire-pit seat out back. The workshop almost always makes it as two separate rectangles that butt together, not one bent piece. They fit more cleanly, ship more safely and unzip for washing one at a time. If your bench wraps a table on three sides, see [U-shaped banquette cushions](https://cushionguide.com/cushions/u-shaped-cushions/); for straight built-ins, see [banquette cushions](https://cushionguide.com/cushions/banquette-cushions/). The short definition is in the glossary under [L-shaped cushion](https://cushionguide.com/glossary/#l-shaped-cushion).

## Three ways to build the corner

| Build | How the pieces meet | Good for | Watch for |
|---|---|---|---|
| Two pieces, one owns the corner | One cushion runs its full wall into the corner; the other is its wall run minus that depth | Most nooks and corner benches; the usual build | Decide which piece owns the corner before you measure |
| Corner square plus two arms | A square corner cushion, such as 20.75 x 20.75 in, with a separate cushion on each arm | Long, matching arms | Three pieces to order, each at its own size |
| One-piece L | Cut from a lettered template you confirm edge by edge, thickness included | Small corners only | Costs considerably more, the cover is hard to refit, much less margin for error |

Angled corner? Use two rectangles and one trapezoid so every seam lands on a seat edge. A pillar mid-seat? One cushion notched around it, or separate sections that butt against it.

## Measuring an L, with the subtraction written out

|   |   |
|---|---|
| Each leg | End-to-end length along the wall, measured from the back corner |
| Seat depth | One number if both legs match; label each leg if they don't |
| Short piece | Its wall run minus the corner cushion's depth: 61 in beside a 19 in cushion is about 42 in |
| Worked example | Runs of 74 in and 180 in at 19 in deep became seats of 74 in and 161 in |
| Back cushions | Shortened by the backrest thickness: those 14 in high backs were 74 in and 178 in, the long one being 180 in minus a 2 in back |
| Outside and inside | Outside 90 x 55 in with inside 72.75 x 39 in is also enough to plan the split |
| Thickness | 4 in (10 cm) standard and adjustable; 2 in (5 cm) is the thinnest standard foam |
| Tolerance | Hold lengths about 1/4 in shy of the frame so no edge hangs over |

## Fabrics for a corner that gets used

Corners collect people. Our gallery covers the range: sage [bouclé](https://cushionguide.com/fabrics/boucle-and-teddy/) on an oak-framed storage bench, cognac [faux leather](https://cushionguide.com/fabrics/faux-leather/) under a sunny window, a denim microcheck from the [checked linen and gingham](https://cushionguide.com/fabrics/checked-linen-and-gingham/) family on a corner window seat, and a green awning stripe in a cottage kitchen.

The mudroom corner with a golden retriever sitting under the coat hooks wears a [pet-friendly weave](https://cushionguide.com/fabrics/performance-and-pet-friendly/), the right call anywhere paws and boots arrive together. For a fire-pit bench or any seat the rain can reach, use [outdoor acrylic](https://cushionguide.com/fabrics/outdoor-acrylic/). Stripes come with one warning: the roll is about 55 in (140 cm) wide, so stripes run front to back and a long striped piece needs a seam.

## Foam, thickness and lift-up lids

Standard foam is high-density polyurethane, about 2.0 lb/ft³ (32 kg/m³), medium-firm at roughly 6 to 7 on a 1-to-10 scale. Standard thickness is 4 in (10 cm). On one US order the workshop confirmed that 3 in or 4 in didn't change the price of the L, so choose thickness on comfort and table height. Check it in the [seat height calculator](https://cushionguide.com/studio/seat-height-calculator/).

Many corner benches are storage benches. If a lid lifts, split the cushion at each lid break and add ties; [storage bench cushions](https://cushionguide.com/guides/storage-bench-cushion-hinged-lid/) has the detail. Backrests can run along one leg only, such as a foam wedge along the longer run, and where two long cushions overlap in a corner, each can have its own backrest.

So, partner: which of your two legs is longer, and does either one open?

## Sixty-five-inch arms and a square in the middle

A family in the US sent a hand sketch of their L-shaped kitchen bench: 65 in arms, 20.75 in deep, piping wanted. The workshop explained that L-shapes are made as separate cushions meeting at the corner, and together they settled on three pieces: one arm, a square corner, the other arm.

Then they re-measured, which I respect. The final sizes were 20.75 x 65 1/8 in, 20.75 x 20.75 in and 20.75 x 65 in, holding about 1/4 in back so no edge hangs over the frame. Each piece went through the standard listing with its own thickness, fabric and piping. Tolerance is kindness to your future self.

## Where L-shaped orders go wrong

- ✗ Giving the full wall run for both legs, or measuring the outside of the frame. Either way the corner is counted twice and one leg comes out long.
- ✗ Forgetting the second backrest. It is shortened too, by the thickness of the first backrest.
- ✗ Ordering an angled leg as a rectangle. If front and back lengths differ, it is a trapezoid; if checkout doesn't ask for a drawing, you are on the wrong listing.
- ✗ Laying one long cushion across a storage bench with two lids. Split at each lid break and add ties.
- ✗ Leaving the layout out of the order note. Write each piece's size and which piece owns the corner, then ask for a photo before dispatch.

> On an L-shaped bench, one cushion owns the corner. The other is its wall run minus that cushion's depth: 61 in beside a 19 in deep cushion is about 42 in.
>
> — Nate

## Styling the corner, and tools for the math

A corner wants one good pillow, not five. The sage bouclé nook pairs its cushions with a round table and a jar of wildflowers; the leopard-print shaker banquette lets black spindle chairs do the talking; the cognac window seat goes full boho with kilim pillows and a braided jute rug. Pick one direction and let the corner anchor it.

For the numbers, lay out both legs in the [3D bench cushion builder](https://cushionguide.com/studio/bench-cushion-builder/), then read [measuring both runs of an L](https://cushionguide.com/guides/l-shaped-bench-cushion-measurements/) and [which piece owns the corner](https://cushionguide.com/guides/l-shaped-cushion-corner-joint/). An angled leg goes through the [trapezoid cushion calculator](https://cushionguide.com/studio/trapezoid-cushion-calculator/), and 120° or 45° corners have their own collection in [angled corner bench cushions](https://cushionguide.com/concepts/angled-corner-bench-cushions/). L-shaped floor sofas live under [modular floor sofas](https://cushionguide.com/cushions/modular-floor-sofas/).

> **Tailor's margin:** Draw the L from above and shade the cushion that owns the corner. Then subtract its depth, 19 in or whatever yours is, from the other leg.

## Buyer questions

**A common question:** Is it better to make my corner bench cushion as one L-shaped piece or as two?

**The workshop's answer:** Two or more separate cushions meeting flush at the corner is what the shop recommends. They fit more cleanly, ship much more safely and are easier to handle, unzip and wash. A one-piece L makes the cover hard to take off and put back, costs considerably more and leaves far less margin for error. A small L can still be one piece: the shop turns your sketch into a lettered template and asks you to confirm every edge and the thickness.

**A common question:** What measurements do you need for an L-shaped bench that also gets back cushions?

**The workshop's answer:** The end-to-end length of each leg, the seat depth and thickness, and a sketch or photo. Say whether any part is angled and whether you need backrests, and add a photo of the nook plus a picture of the backrest style you like. Outside and inside dimensions of the L also work; the shop plans the two-piece split, confirms it and checks the units before quoting.

**A common question:** How do I measure a corner bench so the two cushions don't overlap?

**The workshop's answer:** Measure each arm wall to wall from the back corner, plus the seat depth, and send a photo or sketch; the shop works out the corner. One cushion runs its full wall into the corner and the other is shortened by the seat depth. Runs of about 68 1/2 in and 53 in (174 and 135 cm) at 17 3/4 in (45 cm) deep became 53 x 17 3/4 in and 50 3/4 x 17 3/4 in (135 x 45 cm and 129 x 45 cm). Back cushions are shortened the same way, by the backrest thickness.

**A common question:** My corner bench is an odd shape. How should I send the measurements?

**The workshop's answer:** Send a photo of the space and a hand-drawn sketch with every dimension written on it; labeling the sides A, B, C and so on works well. For a back cushion, include the wall height above the seat, and mention any trim that sticks out. For angled banquettes the shop can send a diagram of exactly which measurements it needs, and for complex pieces it sends its own drawing and waits for your OK before production.

**A common question:** On an L-shaped floor sofa, what's the difference between an open and a closed corner?

**The workshop's answer:** It's the backrest at the end of the run. A closed corner ends in an L-shaped backrest that wraps the end: 3 L-shaped backrests plus 1 straight, about 118 x 79 in (300 x 200 cm) overall. An open corner ends in a straight backrest and leaves that end open like a chaise: 2 L-shaped plus 2 straight. Pick the open-corner option or write it in the personalization box; an extra straight backrest lets you switch layouts.

## Corner questions, answered

### Are the pieces of a two-piece L-shaped cushion made at the same time?

Yes. Each piece is ordered as its own cart item at its exact drawn size, and the pieces are produced together. Write in the order note which piece owns the corner, so the set is checked against your layout.

### Can an L-shaped bench have a back cushion on one side only?

Yes. Backrests can run along one leg only, such as a foam wedge along the longer run. Where two long cushions overlap in the corner, each can have its own backrest, with the second one shortened by the first one's thickness.

### Does a notch for a post make an L-shaped cushion cost more?

On the custom-shape listing a notch adds nothing by itself; cut-outs around obstacles cost a little more. There is no charge for the template the workshop draws for your approval, though angled and custom-shaped pieces don't get extra discounts.

### How thick should an L-shaped kitchen bench cushion be?

The standard is 4 in (10 cm) and can be changed. Kitchen corners often go thinner for table height; one buyer in the US chose 2 in for a small one-piece L. The thinnest standard foam is 2 in (5 cm), and anything thinner is made without piping.

### Can two floor sofas be joined into an L-shaped corner?

Yes. Order two of the same teddy floor sofa and the workshop swaps in straight backrests where needed so they meet as a corner, refunding the backrest price difference. Colors can be mixed piece by piece, and an L set ships in about 6 parcels.

## Related at the atelier

- [L-Shaped Bench Cushions on a Built-In Terrace: Props Explained](https://cushionguide.com/readings/oatmeal-l-shaped-masonry-terrace-seat-cushions/): An L-shaped bench cushion for a built-in masonry seat is best made as two rectangles, with one piece running the full length through the corner and the other butting against it.
- [L-Shaped Bench Cushion for a Chamfered Corner Nook in Dove Gray](https://cushionguide.com/readings/dove-gray-corner-nook-cushion-caramel-piping/): An L-shaped bench cushion for a chamfered corner nook works best as one piece that follows all three runs, left, angled center and right, so there is no seam where people lean.
- [How much is an L-shaped or corner bench cushion?](https://cushionguide.com/answers/l-shaped-corner-bench-cushion-cost/): An L-shaped bench cushion is quoted from both side lengths and the seat depth, so send all three before asking for a price.
- [Can you make an L-shaped floor cushion sofa?](https://cushionguide.com/answers/l-shaped-floor-cushion-sofa-custom/): Yes: an L-shaped floor cushion sofa is made by ordering two floor sofa sets, and the workshop adds the corner backrest free.
- [Which piece owns the corner? Joining L-shaped bench cushions](https://cushionguide.com/guides/l-shaped-cushion-corner-joint/): For most L-shaped bench cushions, make two rectangles that butt together: one cushion runs into the corner and the other is shortened by that cushion's depth, so a 61 in run beside a 19 in deep…
- [Sage green bench cushions, olive and khaki: greens that aren't 'a green green'](https://cushionguide.com/concepts/sage-olive-and-khaki-cushions/): A sage green bench cushion is best chosen from a physical swatch, because greens shift more than any other color under kitchen and window light.
- [Every cushion shape, drawn once, with the numbers it needs](https://cushionguide.com/guides/cushion-shapes-chart/)

*± 1/4 in — Nate*

---

Written by Nate Kowalski (https://cushionguide.com/masters/nate/) for CushionGuide (https://cushionguide.com/about/). The site explains made-to-measure cushions and the partner workshop makes them; measurements are in inches first. This Markdown mirrors the page at https://cushionguide.com/cushions/l-shaped-cushions/